My computer starts making a very loud continuous noise after 10 to 15 minutes

[asifakhtar]

I have a P4 S478 computer. I built it myself 2 years ago. It starts making a very loud continuous noise after 10 to 15 minutes, then it restarts automatically. It sometime freezes after making a very loud continuous noise.

 

I checked my harddrive, it is quiet. I also changed POWER SUPPLY but again the loud noise is coming. I also removed the dust from the CPU fan and the heatsink.

[sunny staines]

is it the cpu fan bearings going result cpu overheats then shuts down.

 

take the lid off turn on and watch the cpu fan for stuttering also put your ear close to detect where noise comming from. could be the fan on the graphics card going overheating the graphics.

[asifakhtar]

When I take the case cover off, the sound doesn’t come and it doesn't freezes or restarts. I also tried to hear CPU fan but it is not producing too much noise. My graphics card is embedded and it doesn't have any fan.

 

Thank you for the help.

[sunny staines]

the pc could be overheating somehow and taking the case off is preventing this.

[Spexx]

Sounds like a classic example of something like a loose cable etc getting into the CPU fan (hence the noise). The CPU overheats as a result (hence crashes, freezes etc). Taking the lid off the case has moved whatever it was getting in the fan, so the problem has gone away - magic.